With the advent of annually-resolved polar ice records extending back to 70 ka, marine and continentalpaleoclimate studies have now matured into a discipline where high-quality age control is essential forputting on an equal pace layer-counted timescale models and Late Quaternary sedimentary records.High-resolution UeTh dating of speleothem records and 40Ar/39Ar dating of globally recordedgeomagnetic excursions have recently improved the time calibration of Quaternary archives, reflectingthe cross-disciplinary effort made to synchronize the geologic record at the millennial scale. Yet, tiepointswith such an absolute age control remain scarce for paleoclimatic time-series extendingbeyond the radiocarbon timescale, most notably in the marine record. Far-travelled tephra layersrecorded both onland and offshore provide an alternative in such instance to synchronize continentaland marine archives via high-resolution 40Ar/39Ar dating of the parent volcanic eruption. High-resolution40Ar/39Ar data are reported herein for one such volcanic marker, the Green Tuff of Pantelleria and its Y-6tephra equivalent recorded throughout the Central and Eastern Mediterranean. Published radiochronometricand d18O orbitally-tied ages for this marker horizon scatter widely from about 41 ka up to56 ka. Our new 40Ar/39Ar age at 45.7 1.0 ka (2s) reveals that previous estimates are biased by morethan their reported errors would suggest, including recent orbital tuning of marine records hosting thetephra bed that are reevaluated in the context of this study. This improved estimate enables potentialphase lags and leads to be studied between deep-sea and terrestrial archives with unrivaled (nearmillennial)40Ar/39Ar precision in the marine record.
|Numero di pagine||14|
|Rivista||Quaternary Science Reviews|
|Stato di pubblicazione||Published - 2013|
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